Author Topic: UT61E DC voltage measurements problem  (Read 132 times)

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Offline BuhefadeTopic starter

  • Newbie
  • Posts: 1
  • Country: pl
UT61E DC voltage measurements problem
« on: July 14, 2024, 06:46:32 pm »
Hello
I tried to dig through Ut61e posts but I wasn't able to find similar problem
-On DC voltage (both auto/manual) display can't be zeroed even when probes shorted (shows small negative voltage)
-gives different results when probes switched. Example: read out +4.5V - > switch probes and same potential read out - 2.4v.
-measurements are not sonsistent in overall.
Tried:
Board nad main switch cleaned
VR1 replaced
Corrected soldering around main IC

 

Offline Mickle T.

  • Frequent Contributor
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  • Posts: 474
  • Country: ru
Re: UT61E DC voltage measurements problem
« Reply #1 on: Today at 06:36:11 am »
If there is no contamination on the printed circuit board and on the switch lamellas, then I see only two reasons for the zero shift of the multimeter: failure of the auto-zero correction capacitor C6 470nF (pin 14) or breakdown of the input circuits of the ADC U1 ES51922.
 


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